fix: support fixed-size array dimensions in signature parser

[Maroutis]

Summary

• The Lark grammar for ABI signature parsing only handled dynamic arrays ([]) but rejected fixed-size arrays ([N]), causing lint failures on valid Solidity types like address[11], uint256[5][5], and address[5].
• Extended the array grammar rule to accept both [] and [N], updated the array transformer to preserve the size, and fixed the named_tuple filter to correctly identify fixed-size array suffixes.
• Added 5 test cases covering single-dimension, multi-dimension, mixed fixed/dynamic, tuple, and 3D fixed-size arrays.

Test plan

• Existing test_reduce_signature parametrized tests still pass (no regressions)
• New test cases pass: address[11], uint256[5][5], uint256[3], bytes32[2][], (uint256,address)[3], uint256[2][3][4]
• erc7730 lint calldata-curve.json no longer errors on the Curve router signature

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